Análise térmica de um trocador de calor casco e tubo multipasse utilizado na recuperação de calor da vinhaça

Abstract

The heat exchange process between two fluids that are at different temperatures occurs in many engineering applications. The equipment used to implement this exchange is known as a heat exchanger, and its specific applications can be found in room heating and air conditioning, power production, process heat recovery and chemical processing. These equipments are often used in oil cooling, such as preheaters in plants and in chemical industry processes. The present work aimed to perform the thermal analysis stage, one of the 3 phases that integrate the heat exchanger project, in order to size a hull heat exchanger and multipass tube (1 pass in the shell and 2 passes in the tube) to be applied in the heat recovery of vinasse, using it in the preheating of wine in the process of continuous alcoholic distillation. The final design temperatures of the hot and cold fluid currents, respectively vinasse and wine, were defined based on the literature. The hot fluid load enters the heat exchanger at a temperature of 100.02°C and leaves it at 62.20°C. The cold fluid current reaches the device at a temperature of 34°C, absorbs heat and leaves it at a temperature of 62°C. For these specifications, the results obtained in the thermal analysis were: Exchanged Heat Rate (Q) = 7,537,171W; Total Thermal Exchange Area (A) of 513.70 m2 , Global Coefficient of Thermal Exchange (U) of 520.00 W m2K ,; Shell Diameter (DC) of

1,524 m; Tube Diameter (Dt

) 0.0254m, Tube Length L = 2.44 m (Double Tube Path),

Number of Tubes (Dt

) of 1,324 tubes. The study obtained reasonable results

consistent with those available in the literature.